Bind default pre-heat temperature to current build plate temperature
Bind default pre-heat temperature to current build plate temperature

Currently the setting 'resets' when you go out of the print monitor mode. That wasn't the original intention but it works kind of nicely. We'll bring it up in a meeting whether this needs to be changed.

Contributes to issue CURA-3161.

fieldOfView/Cura,Curahelper/Cura,hmflash/Cura,fieldOfView/Cura,ynotstartups/Wanhao,hmflash/Cura,ynotstartups/Wanhao,Curahelper/Cura